Process for preparing biaxially oriented hollow shaped articles from thermoplastic materials
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United States of America Patent
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May 24, 1983
Issued Date -
N/A
app pub date -
Mar 4, 1980
filing date -
May 4, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing biaxially oriented hollow shaped articles, in particular bottles of thermoplastic material, by biaxial draw- and blow-molding comprises blow-molding a preform and subsequently maintaining the thermoplastic material in close contact with the hot walls of the mold at a temperature which is in the range from about the minimum effective temperature for biaxial orientation of the thermoplastic material to about 40.degree. C. above this temperature for a period of time which is sufficient to partially reduce internal residual stresses in the hollow shaped articles. Following this partial thermo-stabilization, the hollow shaped article preferably is subjected to cooling, whereby the pressure within the article is at least partially maintained or the shaped article is cooled or allowed to shrink and subsequently subjected to a second blow-molding procedure.
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